Codemotion

Tech Lead Developer (Node.js / React)

We are looking for an experienced Tech Lead Developer to join our engineering team and lead the development of high-quality, scalable web applications.

Location: Remote / Hybrid Level: Senior / Tech Lead

About the Role

As a Tech Lead, you will combine deep technical expertise with leadership skills to guide a team of developers, make key architectural decisions, and deliver robust, maintainable products. You will be responsible for both hands-on coding and mentoring the team while ensuring high code quality and best practices.

Key Responsibilities:

• Lead and mentor a team of frontend and backend developers
• Design and implement scalable architecture for web applications
• Write clean, efficient, and maintainable code using modern technologies
• Drive technical decisions and define best practices for the team
• Participate in code reviews and ensure high code quality standards
• Collaborate closely with Product Managers, Designers, and other stakeholders
• Optimize application performance and scalability
• Mentor developers and support their professional growth

Requirements:

• 10+ years of professional experience in software development
• Strong expertise in JavaScript / TypeScript
• Deep knowledge of Node.js (backend) and React (frontend)
• Proven experience as a Tech Lead or Senior Developer leading small to medium teams
• Solid understanding of modern frontend and backend architecture patterns
• Experience with RESTful APIs, database design, and performance optimization
• Strong problem-solving skills and ability to make technical trade-off decisions
• Excellent communication and leadership skills

Tech Stack:

• Frontend: React, TypeScript, JavaScript
• Backend: Node.js
• Other tools: Git, Docker, AWS / Cloud services (a plus)

We Offer:

• Opportunity to work with modern technologies and complex projects
• Direct impact on product development and architecture
• Professional growth and mentoring opportunities
• Competitive compensation

Main requirements

Candidates should ideally be based in Krakow. We may also consider strong candidates from other locations who can travel to Krakow regularly. The company currently has team members who come to Krakow approximately once a month for several days.

Requirements

• Strong, demonstrable expertise in Rust — async/concurrent code with tokio, trait-based abstractions, error handling, performance-sensitive code paths
• Deep understanding of Ethereum architecture: transactions, blocks, gas mechanics, ERC-20 tokens, DEX mechanics, MEV supply chain (searchers, builders, relays)
• Experience building and operating systems that handle real money or critical infrastructure — failure modes, kill switches, monitoring, rollback plans
• PostgreSQL proficiency: query optimization, high-throughput time-series schema design, migrations
• 5+ years of software engineering experience with complex backend systems and end-to-end technical ownership

Main requirements

We are looking for a QA Lead to head a newly expanding QA function for an in-flight retail product used by airlines. The specialist will define QA processes, coordinate Manual and Automation QA engineers, and ensure product quality across all components. Domain experience in retail or aviation is a plus but not a strict requirement.

Requirements

Position name: QA Lead

Level: Senior

Hard skills

• 7+ years of QA experience
• Experience leading or coordinating a QA team or QA function
• Strong experience with both manual and automated testing
• Experience defining QA processes, test strategies, and quality standards
• Experience with test planning and coverage management across multiple product components
• Strong experience with Jira for test case and defect management
• Experience working in Agile/Scrum environments (2-week sprints, backlog refinement)
• Strong communication skills with developers, product managers, technical leads, and business stakeholders
• Comfortable working independently in a fully remote environment

We are looking for a strong Senior QA Engineer with solid experience in crypto processing and blockchain-based payment systems. Experience with major networks such as Solana, Tron, Litecoin, and Bitcoin is very important. The ideal candidate should have hands-on experience testing complex web applications, crypto transaction flows, wallet operations, deposits, withdrawals, confirmations, edge cases, API integrations, and business-critical financial systems. Strong knowledge of OpenAPI testing, webhook validation, API requests/responses, error handling, data consistency, and integration testing is required. The role involves ensuring the quality, reliability, and security of crypto processing workflows across multiple blockchain networks, including testing transaction statuses, reconciliation logic, reporting, analytics, and multi-tenant role-based access scenarios.